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media: ivtv: don't call s_stream(0) if not streaming

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Recently a WARN_ON was added in v4l2-subdev.c to warn if s_stream was
called unnecessarily. The ivtv driver hits this once when it is loaded for
the first time. Add a bool to avoid this warning.

[hverkuil: added a comment for the sd_video_is_streaming field]

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Hans Verkuil 2023-11-02 15:04:05 +01:00 committed by Mauro Carvalho Chehab
parent 074728523d
commit c411b39df8
2 changed files with 4 additions and 1 deletions
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1
drivers/media/pci/ivtv/ivtv-driver.h
View file

@ -619,6 +619,7 @@ struct ivtv {
u32 hw_flags; /* hardware description of the board */
v4l2_std_id tuner_std; /* the norm of the card's tuner (fixed) */
struct v4l2_subdev *sd_video; /* controlling video decoder subdev */
bool sd_video_is_streaming; /* is video already streaming? */
struct v4l2_subdev *sd_audio; /* controlling audio subdev */
struct v4l2_subdev *sd_muxer; /* controlling audio muxer subdev */
resource_size_t base_addr; /* PCI resource base address */

4
drivers/media/pci/ivtv/ivtv-streams.c
View file

@ -623,10 +623,12 @@ int ivtv_start_v4l2_encode_stream(struct ivtv_stream *s)
/* Avoid tinny audio problem - ensure audio clocks are going */
v4l2_subdev_call(itv->sd_audio, audio, s_stream, 1);
/* Avoid unpredictable PCI bus hang - disable video clocks */
v4l2_subdev_call(itv->sd_video, video, s_stream, 0);
if (itv->sd_video_is_streaming)
v4l2_subdev_call(itv->sd_video, video, s_stream, 0);
ivtv_msleep_timeout(300, 0);
ivtv_vapi(itv, CX2341X_ENC_INITIALIZE_INPUT, 0);
v4l2_subdev_call(itv->sd_video, video, s_stream, 1);
itv->sd_video_is_streaming = true;
}
/* begin_capture */